Robert Sternberg is an American psychologist most noted for his research in intelligence, love/hate, wisdom, and creativity. Experiences from childhood lead him to research intelligence measurements and how effective they were. This led him to develop the Triarchic Theory of Human Intelligence which proposes that intelligence is comprised of relationships between differing facets of abilities: analytical, creative, and practical.
These abilities work together to influence an individual's success within their social and cultural environments. Sternberg is also credited with developing the triangular theory of love which identifies different types of relationships which are comprised of three components of love: intimacy, passion, and commitment. There are four combinations of these love types which make up different types of relationships: infatuation (passion with no intimacy or commitment), romantic love (intimacy and passion but no commitment), empty love (commitment but no intimacy or passion), and consummate love (all three factors).